Zimbra 5.0 Kernel Panic, how to backup the data?

Hi
our Zimbra server crashed after about two years with a kernel panic error!
i tried but can't recover it, now i download and installed new zimbra inside VMware ESX and want to backup my data from old mail server to new one.
how can i backup the data using live Disks? i mean which file should i backup and how i can restore them?
Thanks in Advance

You should go to the wiki (link at the top of this page) and search for the words 'disaster recovery', there are also examples (wiki/blog/forum threads) on how to move a Zimbra install to a new server - if the server move is a 32bit to 64bit then there's a wiki article that covers that in detail.